Find out what weapon it came out of and look at Numrich Arms/Gun Parts on the Internet.
They have an abundance of original parts most of the time. Also as a last resort if you have a Lowe's or Menards close they have screws that may be similar in the bolt, screws section usually in individual metal door trays.
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
-- John F. Kennedy